os/modules/bluetooth/default.nix

{
  lib,
  config,
  pkgs,
  ...
}: {
  hardware.bluetooth = {
    enable = true;
    # Disable bluetooth on startup to save battery
    powerOnBoot = false;
    # Disable useless SIM Access Profile plugin
    disabledPlugins = [
      "sap"
    ];
    settings = {
      General = {
        # Enables experimental features and interfaces.
        # Makes BlueZ Battery Provider available
        Experimental = true;
        AutoEnable = true;
      };
    };
  };

  services.blueman.enable = true;
  environment.etc."wireplumber/bluetooth.lua.d/51-bluez-config.lua" = {
    text = ''
      bluez_monitor.properties = {
        ["bluez5.enable-sbc-xq"] = true,
        ["bluez5.enable-msbc"] = true,
        ["bluez5.enable-hw-volume"] = true,
        ["bluez5.headset-roles"] = "[ hsp_hs hsp_ag hfp_hf hfp_ag ]"
      }
    '';
  };
}